TED is filled with more than 900 on-demand videos of experts around the world giving talks about various topics. Subjects range from "Five ways to listen better," to "How algorithms shape our world," and "Building a dinosaur from a chicken."

Intimidated by these topics? Don't be. The most addicting part of TED is that these experts have a way of presenting otherwise complicated topics in an understandable way.

This freemium app is loaded with butt-kicking workout videos begging to be played on your home television. The latest update includes AirPlay support, so you can now launch any of the 10- to 90-minute workouts on the big screen to help you meet those New Year's resolutions. (Or at least try.)

"Shark Week" fanatics, rejoice: the Discovery Channel app is filled with extra shark-related content ready to be streamed to your TV with AirPlay. Full episodes of "Shark Week" and other Discovery Channel shows aren't available, but the app is stocked with supplementary videos like behind the scenes, interviews, and quizzes.

Calling all science geeks! Science360 is a free, AirPlay-compatible iPad app filled with hundreds of videos covering all things science. Launch a video and tap the AirPlay button to learn about underwater excavations, lasers, the human body, and other geeky stuff on your HDTV.

If you've been waiting for an excuse to let out your inner baker, Martha Stewart Makes Cookies is the perfect opportunity. Newbies and seasoned bakers can browse through dozens of cookie recipes in a clean interface, and learn from the how-to videos, available for TV streaming via AirPlay.

With the National Public Radio app, the latest news, on-demand shows (like "This American Life"), and local station streaming are ready to be played back to your home theater with AirPlay. The app also allows you to create a playlist of on-demand content, making it easy to keep up with the latest NPR shows.

Those nostalgic for the good ol' shows like "Antiques Roadshow," "History Detectives," "Nova," and "Secrets of the Dead" will love this free PBS app. All these shows (and more) are available on demand, and can be streamed to your TV using AirPlay.